A numerical treatment is developed and implemented to solve the constitutive equations of nematodynamics according to the Leslie-Ericksen formulation for a cylindrical geometry. Nematic director equations in three dimensions are coupled to a Navier Stokes description of the velocity. This model is used to study the influence of the sample size for an experimental set-up corresponding to an combined electron spin resonance (ESR) rheological experiment in which the nematic sample is subject to a constant rotational velocity and to an aligning magnetic field perpendicular to the axis of rotation. The results of the simulations are employed to interpret experimental findings for a series of measurements of the ESR signal of tempone- 14 N dissolved in capillaries of different sizes containing the nematic liquid crystal ZLI 1083, with diameters ranging from 0.1 to 0.5 mm.

Exploration of size effects in cylindrical nematic samples: A numerical simulation and ESR study

POLIMENO, ANTONINO;CORVAJA, CARLO
2002

Abstract

A numerical treatment is developed and implemented to solve the constitutive equations of nematodynamics according to the Leslie-Ericksen formulation for a cylindrical geometry. Nematic director equations in three dimensions are coupled to a Navier Stokes description of the velocity. This model is used to study the influence of the sample size for an experimental set-up corresponding to an combined electron spin resonance (ESR) rheological experiment in which the nematic sample is subject to a constant rotational velocity and to an aligning magnetic field perpendicular to the axis of rotation. The results of the simulations are employed to interpret experimental findings for a series of measurements of the ESR signal of tempone- 14 N dissolved in capillaries of different sizes containing the nematic liquid crystal ZLI 1083, with diameters ranging from 0.1 to 0.5 mm.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/1361024
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